Underhill, Charles R. <br/><br/>
Electrons at work. A simple and general treatise on elctronic devices, their circuits, and industrial uses 

 - New York:  McGraw-Hill  1933 
 - xii, 354p. :   il; 23 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electrónica<br/>Electrónica